Texas Cities
- O'Brien, TX
- O'Donnell, TX
- O'Farrell, TX
- O'Quinn, TX
- Oak Flat, TX
- Oak Flats, TX
- Oak Forest, TX
- Oak Grove, TX
- Oak Hill, TX
- Oak Island, TX
- Oak Leaf, TX
- Oak Point, TX
- Oak Ridge, TX
- Oak Ridge North, TX
- Oak Trail Shores, TX
- Oak Valley, TX
- Oakalla, TX
- Oakhurst, TX
- Oakland, TX
- Oaks, TX
- Oakville, TX
- Oakwood, TX
- Oates Prairie, TX
- Oatmeal, TX
- Obregon, TX
- Ocee, TX
- Ochoa, TX
- Odell, TX
- Odem, TX
- Odessa, TX
- Odom, TX
- Odonnell, TX
- Oenaville, TX
- Ogden, TX
- Ogg, TX
- Oglesby, TX
- Oilla, TX
- Oilton, TX
- Oklahoma, TX
- Oklahoma Flat, TX
- Oklaunion, TX
- Ola, TX
- Olcott, TX
- Old Boston, TX
- Old Dime Box, TX
- Old Glory, TX
- Old London, TX
- Old Moulton, TX
- Old Ocean, TX
- Old River-Winfree, TX
- Old Union, TX
- Olden, TX
- Oldenburg, TX
- Oletha, TX
- Olfen, TX
- Olin, TX
- Olivarez, TX
- Olivia, TX
- Olivia Lopez de Gutierrez, TX
- Ollie, TX
- Olmito, TX
- Olmito and Olmito, TX
- Olmos, TX
- Olmos Park, TX
- Olney, TX
- Olton, TX
- Omaha, TX
- Onalaska, TX
- Onion Creek, TX
- Opdyke, TX
- Opdyke West, TX
- Opelika, TX
- Oplin, TX
- Oran, TX
- Orange, TX
- Orange Grove, TX
- Orangedale, TX
- Orangefield, TX
- Orangeville, TX
- Orason, TX
- Orchard, TX
- Ore City, TX
- Orient, TX
- Orla, TX
- Orrs, TX
- Orton Hill, TX
- Osage, TX
- Oscar, TX
- Osceola, TX
- Ottine, TX
- Otto, TX
- Ovalo, TX
- Overton, TX
- Ovilla, TX
- Owens, TX
- Owensville, TX
- Owentown, TX
- Owl Ranch, TX
- Oxford, TX
- Oyster Creek, TX
- Ozona, TX
